Control mechanism of excavating machines or the like



JuEy 3, 1923,-

I H. H. HARRES 1 CONTROL MECHANISM OF EXGAVATiNG MACHINES Filed March 211 9 OR THE LIKE 6 Sheets-Sheet l 7 H. H. HARRIS CONTROL MECHANISM OFEXCAVATING MACHINES OR THE LIKE Filed March 21 1919 6 Sheets-Sheet 2 H.H. HARRIS V CONTROL MECHANISM OF EXCAVATING MACHINES OR THE-LIKE Jufly3, 1923.

Filed March 21, 1919 6 Sheets-Sheet 5 surfs, 1923. I 1,460,813

H H. HARRIS CONTROL MECHANISM Of EXCAVATING MACHINES OR THE LIKE FiledMarch 21 1919 6 Sheets-Shet 4 I I ,.-I- 1 I JVlZ/v 5M 5 09 (ML H. H.HARRIS CONTROL MECHANISM OF EXCAVATING MACHINES OR THE LIKE July 3,1923.

Filed March 21 1919 6 Sheets-Sheet 5 Bria/av July3,1923.

HH HARRIS 4 CONTROL MECHANISM OF EXCAVAT ING MACHINES OR THE LIKE FiledMarch 21 .{11919 ITTI 6 Sheets-Sheet 6 Patented July 3, 1923 HOLLTS H.HARRIS, 0F LOBAIN, OHIO, ASSIGNOR TO THE THEW SHOVEL COMPANY, OF

LORAIN, OHIO, A CORPORATION OF OHIO.

CONTROL MECHANISM OF EXCAVATING MACHINES OR THE LE.

Application filed March 21, 1919. Serial No. 284,109.

To all whom it may concern:

Be it known that I', HOLLIS H. HARRIS, a citizen of the United States,residing at Lo rain, in the county of Lorain and btate of Ohio, haveinvented a certain new and useful Improvement in Control Mechanism of-Excavating Machines or the like, of which the following is a full,clear, and exact de scription, reference being had to the accompanyingdrawings. 1 This invention relates to an operating mechanism for devicessuch as excavating machines, including a cable drum adapted to be drivenin one direction by a steam engine and to move in the other direction bypull on the cable, under the control of a brake. An object of theinvention is to provide a simple, effective controlling mechanismadapted to be operated by a single manually controlled member. A morespecific object is to so arrange this manually operable controllingmember that it may start the engine, clutch the engine with the drum andcause the release of the brake, or reverse these operations and regulatethe application of the brake. Another object includes the provision of apressure fluid-controlled clutch between the engine and the drum.Another object is the construction of a brake for the drum which mayautomatically operate to resist movement of the drum in one direction ofits rotation and automatically release in the other direction ofmovement of the drum. Still other objects will become apparent in thefollowing description which relates to the drawings.

In the drawings, Fig. 1 is a side elevation of my operating mechanism;Fig. 2 is a plan of the drum and driving mechanism therefor,illustrating my controlling mecha nism connected therewith; Fig. 3 is avertical section through rock arms and slides forming part of thecontrols mounted in a casing; Fig. 4 is a similar section showing adifferent position of the parts; Fig. 5 is a similar section showingstill another position of the parts; Fig. 6 is a transverse sectiontaken on a line indicated by the line 66 of Fig. 3; Fig. 7 is a viewsimilar to Fig. 5 showing still another position of the parts of theslide controls; Fig. 8 is an enlarged detail of a lever shiftable fromidle to operative position for controlling certain of the partsindependently of the others and operable in connection with the slidesshown in Figs. 4 to 7 inclusive; Fig. 9 is a section through a pressurefluid valve controlling the clutch Fig. 10 is a ,similar section showingthe valve in another position; Fi 11 is a View of the gear carrying theclutc removed, illustrating the mountings for the clutch operatingmechanism and counter:

weight therefor; Fig. 12 is a view in the nature of a section through apiston and cylinder forming a part of the clutch operating mechanism;Fig. 13 is an operating rock arm forming a part of this clutch.operating mechanism; Fig. 14 is a detail section a through a brake forthe drum; Fig. 15 is a detail of one of the operating members for thebrake; and Fig. 16 is a section on the line 16-16 in Fig. 14:.

Describing the parts by'the use of reference characters, 1 indicates asuitable motor or engine, preferably a steam engine, 2 the connectingrod driving a crank disk 3 on the,

shaft 4: on which is rigidly mounted a pin ion 5. driving a gear 8journaled on a shaft 9 supporting a drum 10. The drum 10 is adapted toreceive a cable or any suitable flexible member which may operate ascoop or bucket of an excavating device.

In the operation of such device as mentioned, it is desirable'to be ableto release the brake, clutch the gear 8 to the shaft 9,

thus clutching the drum with the engine, and then start the engine, allby the use of a single lever movable through varying positions. Themotion of the lever from neutral towards its extreme position in onedirection clutches the drum with the engine and the successive positionsof the lever start the engine and determine its speed. The movement ofthe lever back from this extreme position where the engine is running atits greatest speed, will first reduce the speed of the engine. andfinally cut ofi' the At 12 is indicated a lever mounted on a rock shaft14. A link 15 is shown as pivoted to the lever and to the upper end of arock arm 16 on a shaft 18 journaled in a casing 19 mounted on a suitablebracket 20. In the upper end of the casing is a slide bar 22. This slideis operated by a finger on the rock shaft 18 having a curved uppersurface and abrupt shoulders at either side adapted to engage a notch 23in the slide, to accomplish certain desired movements consequent uponthe operation of the lever 12. The slide 22 is shown as connectedthrough a link 27 With a valve rod 28 for operatlng a slide valve 29within a valve casing 30.

The valve is shown as a D-valve operating upon a flat valve surface 31at the bottomcf the casing, the casing being provided with a removablecover 33. The rod 28 is shown as extending througha suitable stuffingbox in the end wall of the casing while a pipe 36 leads to the oppositeend wall for hve steam or other pressure fluid.

The valve 29 operates to control passages 37 and 38. The passage 38leads to the pipe 40 connected with the casing and leading to arevoluble closed connection at 42 fitted to the pipe 43 axiallypositioned and carried on the end of the shaft 9 and formingcommunication through an axial passage to a radial passage 45. The pipe45 leads to the inner end of a cylinder 46 whereby pressure may force apiston 47 (Fig. 12') in that cylinder outwardly. This piston, through aconnecting rod 48, may operate a rock arm 50 on a rock shaft 52 carriedby the gear wheel 8.

Rigid on the shaft 9, and preferably formed as enlargements of the drum10, are drum surfaces 54 and 55 forming. respectively a brake drum andclutch drum. Surrounding the clutch drum surface 55 is a collapsibleband 56 secured at one end to an oifset crank pin 58 on the rock shaft52 journaled in a bearing 59 rigid with the gear 8, as illustrated inFig.13. Theother end of the band is adjustably secured by a screw "60 toa pin 61 formed in a boss 62 on the gear 8, whereby the outward movementof the piston 47 tightens this band 56 on the drum surface 55 therebycausing the drum 10 to rotate with the gear 8. A spring 64 surrounds aguided rod 67 which leads through a stud 65, mounted on a boss 66carried by the gear 8, and is pivoted to the lever 50. This spring actsunder-compression to return the piston upon the release or 75 (Fig. 14)adapted to act upwardly on an adjustable shoulder block 77 secured to abrake bar 80. This bar is secured at 81 to one end of a collapsiblebrake band 82 surrounding the drum 54 rigid with the drum 10. The otherend of the brake band 82 is pivotally connected at 84 with a link 85(extending through a slot formedin an enlargement 86 of the brake bar80)- having transverse projections 88 adapted to engage notches on eachside of the enlargement 86.

,The projections 88 are carried on a slidable block 83 whereby they maybe adjusted toward and away from the pivot84 by a nut 89 threaded ontothe rod 85.

When the drum 10 is turning in a direction indicated by the arrow, Fig.14, that is, to unwind the cable the brake is automatically applied inproportion to the amount of release or downward movement .of the member80. As the arm 80 drops downwardly when moving with the brake band 82 onthe drum 54, it passes the stop 90 and then moves tangentially to thestop whereby a continued downward movement contracts the brake bandabout the drum; whereas if the drum 54 were running in a directionopposite to that indicated by the arrow, the tendency for the drum wouldbe to raise the arm 80 thus allowing the brake band to expand. Practicehas demonstrated that this brake is very effective in its applicationwith the drum running toward the arm 80. while in the opposite directionthe friction caused by the brake is negligible.

It will be seen that the lowering of the cam or finger 75 may allow theapplication of the brake to varying degrees under the control of thelever 12, while raising the cam may resist the automatic application,and if entirely raised may relieve the brake irrespective of thedirection of rotation of the brake drum whereas with the drum running inthe direction opposite the arrow the brake is relieved irrespective ofthe position of the finger or cam 75.

The same lever 12 which controls the brake and clutch may operate anysuitable throttle for the engine 1. As indicated in Figs. 1 and 2. thethrottle (not shown) is operated by the rock shaft 92 which is shown asconnected by a rock arm 93 with a link 94 leading forwardly and pivotedat 95 to the rock arm 96.

A more complete description of the mechanism thus tar described 1s asfollows: As-

suming that the lever 12 is in the position shown in Fig. 1, the brake82 on the drum 54 is applied. The clutch and 56 is release-Ll and theengine stationary. To start the device in a direction to wind theflexible member onto the drum 10. the lever 12 s drawn rearwardly. Asstated. the link 91. is connected at 95 to a rock arm 96, and this callyrelcase the brake as described.

arm is looselv journaled about the shaft 18 and is normally connectedwith and operated by the operation of the lever 12 through an actuatingfinger 100, rigid on the shaft 18, and similar to the finger 25 andadapted to act in a notch 101 in the under side of a slide 102 in thecasing 19 and operable parallel with the slide 22 heretofore described.This slide 102 has an upwardly projecting boss 104 providing a notchadapted to receive a projection 105 at thelower end of a slid ableextension arm 106 carried in a suitable guide formed on the rock arm 96.

Thus it will be seen that as the rock shaft is actuated the slide 22operates the connections to the valve controlling the clutch be tweenthe drum 10 and. gear 8, while the slide 102 operates through theprojection 105 on the lever 106 to operate the rock arm 96, in turnactuatingthe rod 94 and throttle mechanism. On the other hand thethrottle may be operated independently of the other mechanism by raisingthe arm 106 so that its projection 105 clears the notched boss 104 onthe slide 102.

Assuming that the parts are idle, to start the mechanism to cause theflexible member to wind onto the drum 10, the lever 1.2 is moved fromthe intermediate or upright position shown in Figs. 1. 2 and 3rearwardly toward the engine. The first part of this movement brings theactuating finger 25 into operative contact with the shou der of thenotch 23 in the slide 22 which through the link 27 and valve rod 28actuates the valve 29 moving it from the position shown in Fig. 9 tothat shown in Fig. 10, where upon live steam or similar pressure fluidmay pass through the passage 38 and pipes 40. 43 and 45 to the cylinder4.0 actuating the piston 47 to swing the rock shaft 52 in a direction totighten the clutch band 50, thus connecting the gear 8 with the drum.

Further movement of the levcr 12 to the rear causes the finger 100 toengage the notch 101 in the slide 102. which through the projection 105actuates the rock lever 100 to move the rod 04 operating the throttleand starting the engine. This same movement of the lever. moving thefinger 75 downwardly out of the path of the brake applying member 80.docs not. however. ap-

ply the brake'bccausc the drum 54 and drum 10 are running in a directionto automati- The levcr 12 may be moved if desired through a considerabledistance. varying the degree of opening of the throttle. and thuscontrolling the device while the parts are functioning as last stated.

The upper surfaces of the lingers and 100 are so shaped that they passidly out of the notches after the complete movcincnt of the slides ineither direction accomplished. Thus as the lever moves from the positionshown in Fig. 1 to that in Fig. 5, the finger 25, having completed theopening of the valve and the consequent application of the clutch,passes idly out of the notch, 'as does the finger 100 after the throttleis completely open, any further movement of the lever 12 in a rearwarddirection being idle. The returning forward movement of the lever 12through a considerable angular distance may regulate the throttle beforethe finger 25 is brought to an active position to move the slide andvalve controlling the clutch. Return to the neutral position, however,releases the clutch. In any of the positions of the lever to the rear ofthe vertical. the finger 75 is out of engagement with the arm 80. Thebrake is automatically applied immediately upon the stopping of, themovement of the drum in a direction to release the. brake, sincedownward movement of the bar 80 and consequent contraction of the brakeband 82 is then permitted, and any load on the drum acts in thedirection of the arrow in Fig. 14 to increase the braking effect ashereinbeforev explained.

Movement of the lever 12 to the,.left in Figs. 1 and 3, or forwardly asillustrated in Fig. 7, causes the fingers 25 and 100 to passv idly outof thanotches, while engaging the edges of the notches at the arcuateouter surfaces, thus preventing inadvertent movement of the slides. Thisforward movement of the lever shoves rearwardly on the link 71 actuatingthe rock shaft 74 in a direction to raise the finger 75 which as statedreleases the brake. If, therefore, a flexible member is drawing on thedrum tending to rotate it in the direction of the arrow in Fig. 14, thebrake tends to automatically apply itself and the actuating finger 75may relieve this brake, the braking action varying in degree as desired,according to the position of the lever 12, thus controlling the speed ofthe drum. A lateral extension 76 on the block 7 7 may limit the downwardmovement of the arm 80 by engaging the stop 90.

Thus for all ordinary operations of the mechanism, the device iscontrolled and regulated by movement of the lever 12. If, however. it isdesired to operate the engine independently of the position of the otherparts of the device-irrespective of whether the clutch is active orinactive and whether the brake is on or oti'-this may be accomplished bymerely raising. the extension arm 106 out of engagement with its slide102 and holding it so raised for temporary operation as desired.

Having thus described my invention, what I claim is: I

1. The combinations with a throttle controlled engine of an operatingmember driven thereby, a friction clutch between &

the engine and the operating member,

ing member, an automatic one-way brake and a clutch for said member, amanually operable controlling member; and connections leading from saidcontrolling memher to the brake and to the throttle of the engine,whereby movement of the manually operable member in one direction from aneutral point actuates the clutch and en-. gine throttle in successiveoperation, said connections comprising a member having a recess thereinand a finger cooperating with a wall of said recess, said brake beingantomatically released when power is applied, and automatically lockedwhen power is shut oil, the power being shut ofi and the clutch releasedsuccessively when the member is moved backwardly toward the neutralpoint, and mechanism associated with the brake whereby continuedbackward movement of the lever beyond a neutral point effects thegradual release of the brake.

3. In a device of the character described, the combination of an engine,a rotating member driven thereby, a clutch between said member and theengine, an automatic one-Way brake for said member, a lever, connectionsbetween the lever and the clutch to definitely control the clutch by theposition of the lever on one side of an intermediate point, andconnections including a slidable member having a shoulder and acooperating finger between said lever and the brake whereby movement ofthe lever on the other side of said intermediate point definitelycontrols and gradually releases the brake as the lever is moved awayfrom I the intermediate point.

-l.Tl1e combination of a throttle controlled engine, a drum driventhereby. a clutch. between the engine and the drum, an automatic one-waybrake tor the drum, the brake being automatically released upon ,windingin of the drum, and automatically looked upon paying out of the drum, asingle manually operable controlling member adapted to be moved in onedirection from the neutral point. and connections associated with saidmember including a slide and a segmental finger cooperating therewithwhereby movement oi said member applies the clutch and throttlesuccessively.

5. in a device of the (fllill'fll'l'Ol' described, the combination, withan engine, of a roneeojeis tat able member, gearing connecting theensaid gearing for applying the clutch, pressure fluid mechanismoperatively connected with said cylinder, a valve controlling suchpressure fluid, an operating lever, connections between said lever andsaid valve adapted to ow ate the valve in one range of movement of thelever and be idle through another range, a brake adapted when inoperative position to prevent retrograde motion of the rotatable member,connections between said lever and brake whereby the lever maintains thebrake in operative position when the lever is in position to actuate theclutch, whereby retrograde motion of the drum in the case of failure ofpower, or insuflicient power, is prevented.

6. In a device of the character described, the combination with athrottle controlled engine, of a rotatable operating member, gearingconnecting the engine and operating member, a clutch having one elementmounted within and revoluble with the gearing, an operating lever,connections between said lever and said clutch, additional connectionsbetween said lever and throttle of the engine, whereby the position ofthe lever determines the position of the clutch and throttle, and meanswhereby the throttle may be controlled independently of said clutch.

7. In a device of the character described. the combination, with athrottle controlled engine, of a rotatable operating member, gearingconnecting the engine and operating member, a clutch having one elementcarried by said gearing. a cylinilcr, a piston therein for operating theclutch, said cylinder and piston being rotatable with said gearing, apassage leading to the cylinder. a valve controlling said passage. meansfor operating the valve including a lost motion connection, means foroperating the en gine throttle, a lever connected witlrezu-b of saidmeans adapted to operate them through ditl'crent zones of movement. and

means for separating the throttle control from said lever to allowindependent actuation oi the throttle.

8. T he combination of a throttle controlled enginc, a drum driventhereby, a pressure fluid operated friction clutch betweenthe engine andthe drum, a brake tending to automatically resist movement of the drumin one direction and be idle in the other direction, and a singlecontrolling means adapted to be moved in one direction from a neutralposition to operate the clutch and throttle and in the other directionfrom the neutral pOSltlOll to release the brake, and means whereby thethrottle may be ope atcd independently of said controlling means.

9. lo a device oi the character described, the combination, with anengine, an operice ill"

ating drum driven thereby, and a clutch mechanism between the drum andengine including a gear adjacent the drum, a cylinder and piston mounted.to revolve about the axis of the drum, a connection between the pistonand the clutch, a passage leading to the cylinder, a valve in saidpassage, a sliding member for operating said valve andhaving a shoulderthereon, an operating 'finger adapted to engage said shoulder and havingan arcuate surface, whereby the slide may be moved by the finger) andheld against return movement by the areuate surface, said surface beingadapted to move outwardly in the slot to prevent further operation ofthe slide. v

10. In a device of the character described, the combination with anengine, an operating drum driven thereby, and a clutch mechanism betweenthe drum and engine, pressure fluid means for operating the clutch,including a valve, a sliding member for operatingsaid valve, and havin ashoulder thereon, an operating finger a apted to engage said shoulderand having an arcuate surface whereby the slide may be moved by thefinger and held against return movement by the arcuate surface.

11. In a device of the character-described,

the combination, with a throttle controlled engine, of a drum for'aflexible member, gearing connecting the engine and drum ineluding aclutch, said cluteh'comprising an expansible member and a drum, acylinder and piston therein mounted to revolve about the axis of thedrum, a connection between the piston and the-expansible ,member foroperating the clutch, a passage leading to the cylinder including apassage axial of the drum, a valve in said passage, and a manuallyoperable means for successively operating said valve and for operatingthe throttle, said means being arranged to permit operation of thethrottle independently of the valve. y

12. In a deviceof the character described, the combination, with athrottle controlled engine, of an operating member, gearing connectingthe engine with the operating member including a clutch, pressure fluidoperated means for actuating the clutch, a valve controlling theoperation of said means, a. slide connected with the valve and havingspaced shoulders, an operating member adapted to engage said shoulders,a rock shaft on which said last named member is mounted, said operatingmember being adapted to actively engage said shoulders for certain partsof the movement. of the rock shaft and to idly abut the shoulders duringother parts of the movement of the rock shaft, manually movable meansfor operating the rock shaft, and a connection leading from saidmanually movable means to the throttle.

13. In a device of the character described, the combination, with athrottle controlled engine, of an operating member and gearingconnecting the engine with the operating member including'a clutch, aslide for o crating the clutch and having spaced sho ders, a rock armadapted to engage said shoulders, a rock shaft on which said arm ismounted, said arm being adapted to actively engage said shoulders forcertain parts of the movementof the rock shaft and to idly abut eithershoulder during other parts of the movement of the rock shaft, manuallymovable means for operating the rock shaft,

and a connection leading from said means t0 the throttle.

.1 4. In a device of the character described, the combination, with anengine, of an op-' erating drum, gearing connecting the drum and engineincluding a clutch, means for operating said clutch including a slide, arock shaft, a connection between the rock shaft and slide in the form ofa rock arm, said slide having shoulders adapted to be engaged by saidarm, a lever for operating,

the rock shaft, an adjacent slide, a second rock arm, a connectionbetween said second rock arm and the engine, and a disengageableconnection between said last named rock arm and second named slide,whereby movement of said rock shaft may control the clutch and theengine.

' 15. In a device of the character described, the combination, with anengine, of an operating drum, gearing connecting the drum and engineincluding a clutch, a rock shaft, a projection carried thereby, a slidehaving shoulders adapted to be engaged by the projection to move theslide, means connecting the slide and clutch, a lever for operating 1matically applied upon? one direction of movement of the drum and to bereleased upon movement in the'opposite direction, and a manually movablecontrolling member adapted to control the engine throttle and releasethe brake in different zones of mov'ement. the throttle having aseparable connection with said member, whereby the throttle may becontrolled independently of the brake.

17. In a device of the character described,

the combination. with a revoluble operating drum adapted to receive aflexible member, an engine for driving the drum in one direction, pullof the flexible member'causing the rotation of the drum in the oppositedirecm0 tion, a brake on said drum adapted to be applied automaticallyconsequent upon the rotation of the drum in the latter direction, aclutch between the engine and the drum, means for operating the clutch,means for releasing the brake varying degrees, an operating lever forcausing such release, means controlling said clutch connected ,with saidlever, and means including a slide and a cooperating segmental fingerconnected with said lever for controlling the'engine, the release of thebrake taking place in a zone of movement in which the other connectionsare in-operative, and starting from brake applied position when thelever is in initial engine stopping position.

18. In a device of the character described, the combination, with adrum, a throttle controlled engine, gearing between the engine and drum,a brake on the drum, said brake tending to apply itself in one directionof rotation of the drum, a lever for releasing the brake in varyingdegrees against its tendency to be applied and acting to leave the brakeapplied in initial stopping position of the engine, a lost motionconnection between said lever and the throttle comprising a slide and acooperating arcuate edged finger, a clutch in said gearing, and meansconnected with said lever for operating the clutch.

19. In a device of the character described, the combination with anengine, of an operating member driven thereby, a sliding member forcontrolling the operation of said engine, said member having a shoulderthereon, a finger adapted to engage said shoulder and having an arouatesurface whereby the slide may be moved by the finger in one direction,and held against return movement by the arcuate surface.

20. In a device of the character described, the combination, with adrum, a brake tending to automatically resist movement of the drum inone direction and be idle in the other direction, an engine/for drivingthe drum, and a manually operable controlling member adapted in onedirection of movement from the neutral position in which the engine isnot operated to start the engine, and in its other direction of movementfrom the neutral position to gradually re-. lease the application of thebrake, said means including also a slidable member, anda cooperatingsegmental finger.

21. In a device of the character described, the combination of a drumfor a flexible member, an engine for driving the drum in one direction,a brake tending automaticallv to resist the movement of the drum in t eopposite direction, said brake includin a flexible band embracing aportion of said drum and having. a lever connected to one end of theband and depending there from and engaging a stop, and a link connectionbetween the other end of the band and said lever, whereby when saidlever drops the angle between the lever and surface of the drum ischanged in the direction to tighten the band by pulling on said link.

22. In adevioe of the character described, the combination of arotatable member having a drum, a brake tending automatically to resistthe movement thereof in one direction, said brake includin a flexibleband embracing a portion of said drum and having a lever connected toone end of the band and depending therefrom, a stop engage-d thereby anda link connection between the other end of the band and said lever,whereby as said lever moves toward the stop its angle between the leverand surface of the drum is changed, pulling on said link, the oppositedirection of movement of said drum tending to raise said lever andautomatically release said brake, and manually operable means forraising said lever independently of the direction of rotation of thedrum.

23. In a device of the character described, the combination, with anengine, of a drum, gearing connecting the engine and drum including aclutch, a pressure fluid operating means for operating the clutch, avalve controlling said means, a brake for the drum, means forcontrolling the brake, a hand lever actuating said means, a slide formoving the valve and having a pairof separated shoulders, a finger forengaging said shoulders, a rock shaft carrying the finger, a secondslide adjacent the first, a finger on the rock shaft for actuating thesecond named slide, a rock arm loosely mounted on the rock shaft, alever slidably carried by the rock arm, coacting projections carried bythe last named slide and said lever adapted to removably engage, meansconnected with said rock shaft and said brake operating lever, and alink conmeeting the first named lever with the engine.

24. In a device of the character described, the combination, with athrottle controlled eng ne, of a drum, gearing connecting the engine anddrum including a clutch, a pressure fluid operating means for operatingthe clutch, a valve controlling said means, a

brake for the drum, means for controlling the application of the brakeincluding a rock shaft, a hand lever for moving said rock shaft, a slidefor moving the valve and having a pair of separated shoulders, a fingerhavin shoulders and an arcuate surface, a roc shaft carrying the finger,whereby movement of the rock shaft may move the slide in eitherdirection through part of its movement while the arcuate surface mayengage the shoulder to resist movement of the slide durin other parts ofthe movement of the rock a aft, a second slide 2% adjacent the first, afinger on the rock shaft for actuating the second named slide, a

rock arm loosely mounted on the rock shaft,

shaft and saidbrake operating lever, a link.

connecting the first named lever with the throttle, whereby said levermay actuate the throttle, close or open the clutch or regulate the brakethrough different zones of" movement respectively and whereby saidthrottle may be operated bythe slidable le- 15 ver only by disconnectingit from its slide.

25. The combination, with a throttle controlled engine, of a drum driventhereby, a clutch between the engine and drum, a brake on the drum, amanually operable member connected with the throttle, clutch and brakeadapted to control the same in different ranges of movement of saidmember, the throttle connection being disengageable, and a second leveradapted to operate the throttle independently of the clutch and brake. YI

In testimony whereof, I hereunto afiix my signature.

HOLLIS H. mm.

